点击运行
<!DOCTYPE html> <html> <body> <h1>JavaScript 变量</h1> <p>相加 5 + 2 + 3 的结果：</p> <p id="demo"></p> <script> var x = 3 + 5 + 8; document.getElementById("demo").innerHTML = x; </script> </body> </html>
运行结果
